Investment Calculator Suite API

Professional investment and financial calculator API offering 12 separate endpoints: compound-interest, retirement-savings, fire, college-savings, future-value, present-value, annuity, investment-growth, inflation-adjustment, rule-of-72, dollar-cost-averaging, and early-retirement. Each endpoint provides specialized calculations with pure mathematical formulas (no external API dependencies), multiple output formats (JSON, text, CSV), and comprehensive financial planning tools. Essential for robo-advisors, financial literacy platforms, banks, credit unions, and financial planning applications.